drm/sysfs: Do not drop device reference twice

device_unregister() already drops its reference to the struct device, so
explicitly calling put_device() before device_unregister() can cause the
device to have been freed before it can be unregistered.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Reviewed-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_sysfs.c

@@ -439,7 +439,6 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
 		device_remove_file(connector->kdev, &connector_attrs_opt1[i]);
 	for (i = 0; i < attr_cnt; i++)
 		device_remove_file(connector->kdev, &connector_attrs[i]);
-	put_device(connector->kdev);
 	device_unregister(connector->kdev);
 
 out:
@@ -472,7 +471,6 @@ void drm_sysfs_connector_remove(struct drm_connector *connector)
 	for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
 		device_remove_file(connector->kdev, &connector_attrs[i]);
 	sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr);
-	put_device(connector->kdev);
 	device_unregister(connector->kdev);
 	connector->kdev = NULL;
 }